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VLSI DesignVolume 2013 2013, Article ID 861691, 11 pages

Research ArticleDepartment of Electronics and Telecommunications DET, Politecnico di Torino, C.so Duca degli Abruzzi, 24 I-10129 Torino, Italy

Received 14 September 2012; Accepted 15 May 2013

Academic Editor: Lazhar Khriji

Copyright © 2013 Francesco Colonna et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The Ultrawideband UWB imaging technique forbreast cancer detection is based on the fact that cancerouscells have different dielectric characteristics than healthy tissues. When a UWB pulse in the microwave range strikes a cancerousregion, the reflected signal is more intense than the backscatteroriginating from the surrounding fat tissue. A UWB imagingsystem consists of transmitters, receivers, and antennas for the RFpart, and of a digital back-end for processing the received signals. In this paper we focus on the imaging unit, which elaboratesthe acquired data and produces 2D or 3D maps of reflectedenergies. We show that one of the processing tasks, Beamforming,is the most timing critical and cannot be executed in softwareby a standard microprocessor in a reasonable time. We thuspropose a specialized hardware accelerator for it. We design theaccelerator in VHDL and test it in an FPGA-based prototype. We also evaluate its performance when implemented on a CMOS45 nm ASIC technology. The speed-up with respect to a softwareimplementation is on the order of tens to hundreds, dependingon the degree of parallelism permitted by the target technology.





Autor: Francesco Colonna, Mariagrazia Graziano, Mario R. Casu, Xiaolu Guo, and Maurizio Zamboni

Fuente: https://www.hindawi.com/



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